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Dan Radison was named the Astros special assignment coach on Oct. 22, 2013 after spending the 2013 season as the club's first ever assistant hitting coach. Radison joined the Astros organization in January 2012 as a special assistant to General Manager Jeff Luhnow, but later took over as the club's first base coach on August 19.

Radison has professional experience as a player, Major League coach, minor league manager and coordinator. Prior to joining the Astros, he spent two seasons as first base coach for the Washington Nationals (2010-11).

Prior to that, he spent three seasons as the St. Louis Cardinals minor league hitting coordinator (2007-09). Radison also managed 12 seasons in the minor leagues between 1984 and 2006, compiling a 622-552 (.530) overall record with three division titles and one league championship.

Radison was drafted as a catcher by the Cardinals out of Southern Illinois University in the 10th round of the 1972 June Draft. He went on to play 200 games in three seasons in the Cardinals farm system, reaching Triple A Tulsa in 1974.

He began his baseball coaching career in 1977 as associate head coach at Broward (FL) Community College, where he spent three seasons (1977-79). He then had coaching stints at the University of Georgia (1978-80) and Old Dominion University from 1981-83.

Radison's first minor league managing position came in 1984 at Rookie Level Kingsport. In 1986, he was named the Single A Appalachian League Manager of the Year after guiding Johnson City to a 44-22 record en route to winning the division title. He also earned a division title the following season at Johnson City (1987). Radison later managed for three seasons (1990-92) at Double A Albany, where he earned a division title in 1991 and the Eastern League Championship in 1992. His most recent managerial stint was in 2006 at Johnson City.

Radison is a 1968 graduate of Columbia (IL) High School, where he earned the Pentzler Award for baseball in 1968 and basketball in 1967 and '68. He has a bachelor's degree in health education from Southern Illinois University and earned his master's degree in counseling from Nova Southeastern University (FL).